Design and Prototype Development of Quadrant Estimation Unit for Laser Beam Rider Guidance System

With the development of science and technology, precision-strike weapons are been considered to be important for winning victory and defending the country during war (or) attack. Laser guidance is one of the major methods to execute precision-strike in modern warfare. At present, the problems faced at the primary stage of Laser guidance has been solved with endeavors of countries. Several technical aspects of laser-beam riding guided system have been mature, such as atmosphere penetration of laser beam, clutter inhibition on ground, laser irradiator, encoding and decoding of laser beam. Further, laser beam quality, equal output power and atmospheric transmission properties are qualified for warfare situation. Riding guidance instrument is a crucial element of Laser-beam riding guided system and also in Radar-beam riding guiding system, and is also a essential element of airborne, vehicle-mounted and individual weapon. The optical system mainly consists of sighting module and laser-beam guided module. Photo detector (Quadrant detector) is the most important sensing device, and also the key to acquire the coordinate information of target space. Currently, in consideration of the 1064 nm of wavelength applied in all the semi-active laser guided weapons systems, lithium drifting silicon photodiode which is sensitive to 1064 nm of wavelength is used in photoelectric detector. Compared to Solid and gas laser, diode laser has many merits such as small volume, simple construction, light weight, long life, low cost and easy modulation. The present work includes the study of Various ATGM, their guidance mechanism, particularly laser beam rider guidance. Study has been carried to understand the composition and operating principle of Laser-beam riding guided system. The present work also deals with prototype development of quadrant estimation unit required for Laser beam rider guidance.

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Clinical applications of a laser guidance system with dual laser beam rays as augmented reality of surgical navigation

CARS 2002 Computer Assisted Radiology and Surgery ◽

10.1007/978-3-642-56168-9_46 ◽

2002 ◽

pp. 281-284 ◽

Cited By ~ 2

Author(s):

Nobuhiko Sugano ◽

Toshihiko Sasama ◽

Shunsaku Nishihara ◽

Hisanobu Nakase ◽

Takashi Nishii ◽

...

Keyword(s):

Augmented Reality ◽

Laser Beam ◽

Surgical Navigation ◽

Clinical Applications ◽

Guidance System ◽

Laser Guidance ◽

Dual Laser

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Low cost audio based intelligent guidance system for visually impaired people

International Journal of Psychosocial Rehabilitation ◽

10.37200/ijpr/v24i3/pr200809 ◽

2020 ◽

Vol 24 (03) ◽

pp. 515-520

Author(s):

Vattumilli Komal Venugopal ◽

Alampally Naveen ◽

Rajkumar R ◽

Govinda K ◽

Jolly Masih

Keyword(s):

Visually Impaired ◽

Low Cost ◽

Guidance System ◽

Visually Impaired People ◽

Impaired People

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Special feature on: Laser beam quality

Optical and Quantum Electronics ◽

10.1007/bf00624991 ◽

1991 ◽

Vol 23 (7) ◽

pp. S998-S998

Keyword(s):

Laser Beam ◽

Beam Quality ◽

Laser Beam Quality

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A V-SLAM Guided and Portable System for Photogrammetric Applications

Remote Sensing ◽

10.3390/rs13122351 ◽

2021 ◽

Vol 13 (12) ◽

pp. 2351

Author(s):

Alessandro Torresani ◽

Fabio Menna ◽

Roberto Battisti ◽

Fabio Remondino

Keyword(s):

Low Cost ◽

Cost Effective ◽

Motion Blur ◽

Guidance System ◽

Prototype System ◽

Active Sensors ◽

Localization And Mapping ◽

Acquisition Speed ◽

Mobile Mapping System ◽

Slam Algorithm

Mobile and handheld mapping systems are becoming widely used nowadays as fast and cost-effective data acquisition systems for 3D reconstruction purposes. While most of the research and commercial systems are based on active sensors, solutions employing only cameras and photogrammetry are attracting more and more interest due to their significantly minor costs, size and power consumption. In this work we propose an ARM-based, low-cost and lightweight stereo vision mobile mapping system based on a Visual Simultaneous Localization And Mapping (V-SLAM) algorithm. The prototype system, named GuPho (Guided Photogrammetric System) also integrates an in-house guidance system which enables optimized image acquisitions, robust management of the cameras and feedback on positioning and acquisition speed. The presented results show the effectiveness of the developed prototype in mapping large scenarios, enabling motion blur prevention, robust camera exposure control and achieving accurate 3D results.

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Investigation of serial coherent laser beam combination based on Brillouin amplification

Laser and Particle Beams ◽

10.1017/s0263034607070127 ◽

2007 ◽

Vol 25 (1) ◽

pp. 79-83 ◽

Cited By ~ 22

Author(s):

SHUANGYI WANG ◽

ZHIWEI LÜ ◽

DIANYANG LIN ◽

LEI DING ◽

DONGBIN JIANG

Keyword(s):

Laser Beam ◽

High Power ◽

Simple Structure ◽

Low Cost ◽

Coupling Efficiency ◽

Laser Beams ◽

Beam Combination ◽

Multiple Beams ◽

Combination Scheme ◽

Stokes Beam

Based on transferring energy from multiple pump beams into one Stokes beam using Brillouin amplification, a serial coherent laser beam combination scheme is presented, which has many advantages, such as, simple structure, low cost, ease of adjustment, higher load capability, scalable easily, etc. Furthermore, it has been demonstrated that the combination of several beams using this method is theoretically possible. But in practice, the amplification of high power Stokes beam is a key problem to solve. In this paper, the amplification of Stokes beam whose power is higher than the pump beam is first studied and proved experimentally. Coupling the two laser beams by this method is proved experimentally, and the coupling efficiency reaches more than 80%. Then the feasibility of multiple beams combination based on Brillouin amplification is analyzed and tested theoretically.

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Beam quality measurements using digitized laser beam images

Applied Optics ◽

10.1364/ao.28.004569 ◽

1989 ◽

Vol 28 (21) ◽

pp. 4569 ◽

Cited By ~ 3

Author(s):

Michael D. Duncan ◽

Rita Mahon

Keyword(s):

Laser Beam ◽

Beam Quality ◽

Quality Measurements

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How to do no harm: empowering local leaders to make care safer in low-resource settings

Archives of Disease in Childhood ◽

10.1136/archdischild-2020-320631 ◽

2021 ◽

Vol 106 (4) ◽

pp. 333-337

Author(s):

Charles A Vincent ◽

Mwanamvua Mboga ◽

David Gathara ◽

Fred Were ◽

Rene Amalberti ◽

...

Keyword(s):

Low Cost ◽

Essential Element ◽

Improve Patient Care ◽

Companion Paper ◽

Team Meetings ◽

Safety Improvement ◽

Do No Harm ◽

Drug Doses ◽

System Improvement ◽

Local Leaders

In a companion paper, we showed how local hospital leaders could assess systems and identify key safety concerns and targets for system improvement. In the present paper, we consider how these leaders might implement practical, low-cost interventions to improve safety. Our focus is on making immediate safety improvements both to directly improve patient care and as a foundation for advancing care in the longer-term. We describe a ‘portfolio’ approach to safety improvement in four broad categories: prioritising critical processes, such as checking drug doses; strengthening the overall system of care, for example, by introducing multiprofessional handovers; control of known risks, such as only using continuous positive airway pressure when appropriate conditions are met; and enhancing detection and response to hazardous situations, such as introducing brief team meetings to identify and respond to immediate threats and challenges. Local clinical leaders and managers face numerous challenges in delivering safe care but, if given sufficient support, they are nevertheless in a position to bring about major improvements. Skills in improving safety and quality should be recognised as equivalent to any other form of (sub)specialty training and as an essential element of any senior clinical or management role. National professional organisations need to promote appropriate education and provide coaching, mentorship and support to local leaders.

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1178 J, 527 nm near diffraction limited laser based on a complete closed-loop adaptive optics controlled off-axis multi-pass amplification laser system

High Power Laser Science and Engineering ◽

10.1017/hpl.2021.3 ◽

2021 ◽

Vol 9 ◽

Author(s):

Deen Wang ◽

Xin Zhang ◽

Wanjun Dai ◽

Ying Yang ◽

Xuewei Deng ◽

...

Keyword(s):

Laser Beam ◽

Adaptive Optics ◽

Closed Loop ◽

Focal Spot ◽

Beam Quality ◽

Laser System ◽

Diffraction Limit ◽

Kdp Crystal ◽

Main Amplifier

Abstract A 1178 J near diffraction limited 527 nm laser is realized in a complete closed-loop adaptive optics (AO) controlled off-axis multi-pass amplification laser system. Generated from a fiber laser and amplified by the pre-amplifier and the main amplifier, a 1053 nm laser beam with the energy of 1900 J is obtained and converted into a 527 nm laser beam by a KDP crystal with 62% conversion efficiency, 1178 J and beam quality of 7.93 times the diffraction limit (DL). By using a complete closed-loop AO configuration, the static and dynamic wavefront distortions of the laser system are measured and compensated. After correction, the diameter of the circle enclosing 80% energy is improved remarkably from 7.93DL to 1.29DL. The focal spot is highly concentrated and the 1178 J, 527 nm near diffraction limited laser is achieved.

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